Steam boiler



H. 0. PRATER.

1 STEAM BOILER. APPLICATION FILED OCT. 4, 1920.

Patented Feb. 21, 1922.

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STEAM Bonnie.

rates as HARRY o. resume, or CLAYTON, WASHINGTQN.

T all whom it may concern: 7 p 1 Be it known'that l, HARRY Q. PRA'IEB, a' citizen of the United States, residing at Clayton, in the county of Stevens and State of lVashington, have invented.certain new and useful Improvements in Steam Boilers, of which the following is aspecification;

The present. invention relates to improve ments in steam boilers of the water tube or tubular type involving the utilizationof up-, per and lower horizontal headers and Vertical water tubes. 'The primaryobject of the invention is the provision of a structure of this nature in which the tubes maywith fa-I cility be installed and the boiler erected quickly and conveniently without the use of I skilled labor or. special tools or equipment,

and the tubes may with equal facility be displaced and withdrawn when required. By the novel construction of the water tubes and their connection with the headers, the tubes may be cleaned while in situ, or when required a tube may be removed and replaced without disturbing the remainder 6f the structure.

To this end the invention contemplates the utilization of a novel form of water tube having threaded portions for the respective headers so arranged and constructed that the tube may be threaded into both headers simultaneously. Other meritorious features reside in the means establishing communication between the water header and steam header and tubes, in the provision for cleaning the tubes, and in other details of construction as will be hereinafter pointed out and claimed.

In the accompanying drawings I have illustrated one complete example of the physical embodiment of my invention wherein the parts are combined and arranged ac cording to the best mode I have thus far devised for the practical application of the principles of my invention.

Figure l is a view partly in perspective and partly in section, showing a portion of a tubular boiler according to my 1nvent1on.

Figure 2 is a front elevation of a boller embodying the invention, a portlon of the tubes being eliminated for convenience of illustration.

Figure 3 is an enlarged view of a detached tube, partly in section to disclose the construction thereof. V

In the preferred form of the inventlon as Specification bf Letters'Patent. lmte t q en-2 19522 Application 'filed octob rfi, ,iazofi Serial no. 4,532.

illustrated drawirigs the boiler I is the verticaltubular. type utilizingthe lower header 1 as a water chamber, and the upper header 2' as a steam chamber, the 'wate'r feed plpe 3 ,entering the .water chamber at the lower end of theboiler, and the steam pipe 4 being .ada'ptedto conduct steam from the steam chamber 5 formed in theheader 2}, s

Th wa e 't g ii eth lt iiai s and are arranged vertically therebetween, preferably in diagonally extending lines as indicated, to permit free access and passage of the gases of combustion from the furnace. to heat the tubes and headers. Each tube is installed separately, and is jointed simultaneously to the headers by means of a socket wrench, and to accomplish this purposethe heavy tubes are each provided with a'closed lower end having a squared head 7 and pro vided with external screw threads 8 extend ing a suitable distance above the squared head. Near the, lower end of the tube an 7 inlet port or orifice 9 is provided extending transversely through the wall of the tube and in position to provide communication between the water chamber 3 and the interior of the tube.

The upper end of the tube is equipped with external threads 10 which are of exactly the same pitch as the threads 8 at the lower end of the tube, but of greater diameter, thus permitting the lower threaded end of the tube to be passed through the socket in the header 2, which socket is larger than the socket in the header 1, and as the twoseries of threads areof the same pitch, the tube may be turned in its two threaded headers I to be secured in place. An outlet port 12 is depicted in the upper end of the tube in Fig ure 3 to pass steam from the upper portionof the tube to the steam chamber 5 in the header 2, and this port is also positioned to open into the steam chamber when the tube is in proper location between the headers; At its upper extremity the tube is fashioned with a reduced squared. 1433.41 10', which bored and drilled to aline with the bore of the tube, as at 11, and this hole is threaded to receive a closure or plug 13, as shown in Figure 3.

T he sockets or tube holes in the respective headers are drilled or bored according to complementary diagrams, and in the erection of the structure, the lower end of the tube which has threads of less diameter than the threads at its upper end, is passed through the larger socket or tube opening in the header 2, and inserted in the smaller socket in the header 1. With the smaller and larger threads engaging the walls of their respective sockets, a socket wrench is applied to each of thesquared heads 7 and 10' and the tube is turned, without twisting or undue strain, to enter its complementary sockets in the headers, leaving the orifices or ports 9 passes through the steam chamber 5 and thence through the steam pipe 4 for use, under suitable regulation means.

For the purpose of cleaning the tube while in situ the plug 13 may be removed and a- .tube cleaning tool be inserted in the tube from the upper end to scrape off deposits of lime &c to be later washed out in usual manner. In removing a tube, the socket wrench is applied at both ends simultaneously and power is thus exerted on both threaded joints to start the tube and render its turning easy and uniform;

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is- The combination with spaced headers having sockets of different diameters and forming a water chamber and a steam chamber, of Water tubes, each having ports communi eating with each chamber and threaded por tions of the same pitch complementary to said sockets, tool heads on the end of each tube projecting beyond the respective headers, and an alined socket and screw plug in one of said tool heads. v

In testimony whereof I afiix my signature.

HARRY o. PR TEn 

